70-357 Exam Guide: What the Developing Mobile Apps Exam Means for Your Preparation Plan
Microsoft identified 70-357 as “Developing Mobile Apps,” and its official preparation session was aimed at people already experienced in mobile application development. That makes this exam relevant mainly as a historical Microsoft credential or study reference, not as a normal current scheduling target. This guide helps you make the important decision first: verify whether 70-357 is available for your account and objective, then choose between studying its legacy mobile-development scope and pursuing a current role-based certification.
What did 70-357 validate?
Exam 70-357 was Microsoft’s “Developing Mobile Apps” exam. The official preparation session describes it as a certification exam for candidates experienced in developing mobile apps, so its purpose was to assess applied mobile-development knowledge rather than provide a beginner-level introduction to programming.
The practical meaning of the exam title
The title points to mobile application development as the central subject, but the supplied Microsoft research does not provide a complete objective list, technology matrix, question format, scoring rule, or domain weighting for 70-357. Treat broad topic labels as orientation only; do not use an unofficial percentage table as a substitute for an official skills outline.
Who was the intended candidate?
The intended audience was an experienced mobile-app developer. Microsoft’s preparation session was explicitly designed for people with experience in developing mobile apps who were interested in taking 70-357. A candidate without practical development experience should therefore build working knowledge first instead of relying on recognition of product names or memorized terminology.
Should you schedule 70-357 now?
Start with availability, not revision. Microsoft’s retirement policy states that retired exams can no longer be taken and that associated certifications or credentials can no longer be earned after the retirement date. Check the current Microsoft Learn certification and exam listings before spending time or money on a 70-357 study plan.
What the retirement evidence shows
Microsoft announced that all remaining exams associated with MCSA, MCSD, and MCSE would retire on January 31, 2021. A Microsoft Q&A question specifically asked whether the Mobile Apps exam 70-357 would be extended beyond 31 Jan 2021, but the displayed response redirected the question to certification-support forums and did not confirm an extension. The available evidence therefore does not support treating 70-357 as an active exam.
What remains after retirement
Microsoft states that a certification or Applied Skills credential already earned remains on the learner’s Microsoft Learn transcript after the relevant exam or assessment retires. That is different from earning the credential today. If your goal is to document current mobile-development capability, use the current Microsoft certification catalogue to identify an available role-based option rather than assuming that a retired 70-xxx exam has a direct replacement.
Do not infer a replacement from the mapping article
Microsoft published a mapping article to help candidates understand how some 70-xxx exams aligned with newer role-based certifications. The supplied mapping does not establish a replacement for 70-357. Use it as historical context, then verify a current certification’s scope and availability on Microsoft Learn before committing to it.
What skills should your study plan cover?
Because the supplied official material does not include a verified 70-357 skills-measured outline or blueprint weights, organize preparation around demonstrable mobile-development tasks rather than invented domains. Your plan should connect concepts to implementation, testing, troubleshooting, and design decisions, while treating each technology-specific topic as something to confirm against archived official material.
Use the official session as a scope signal
Microsoft’s exam-preparation session says it reviewed the topics covered by 70-357, key exam topics, final-preparation resources, and test-taking techniques. It was led by a Microsoft Certified Trainer. This makes the session useful for reconstructing the exam’s broad emphasis, but it does not justify claiming that every topic mentioned in secondary study material was measured.
Build skill categories without claiming blueprint percentages
A practical study inventory can include mobile application structure, platform services, data and network access, user-interface behavior, device constraints, diagnostics, and deployment concerns. These are preparation categories, not official 70-357 domains. Label your notes as “confirmed,” “inferred,” or “needs verification,” and remove any topic that cannot be tied to reliable Microsoft material or a working exercise.
Why hands-on work matters
An experienced developer should be able to explain why one implementation is appropriate under mobile constraints, not merely identify an API name. For each subject, create a small implementation or troubleshooting exercise: define the constraint, choose an approach, test the result, and record what changed. This method produces evidence of understanding without depending on live questions or exam dumps.
How should you prepare for a legacy exam?
Separate historical exam preparation from current-career preparation. If you are studying 70-357 for a transcript, audit, or legacy project, first confirm that the exam objective is still actionable. If you are studying mobile development for work, use the 70-357 scope as background and prioritize current documentation, supported tooling, and a current credential whose published objectives match your role.
Phase one: verify the objective
Record the reason you are considering 70-357: completing an old certification path, understanding a historical technology stack, or developing mobile skills. Then check Microsoft Learn for exam availability, credential status, and any current successor information. Do not schedule from a third-party page alone, and do not interpret an old exam-preparation video as proof that registration remains open.
Phase two: establish your baseline
Use a short diagnostic built from tasks rather than trivia. Can you outline a mobile application’s components, explain how it handles intermittent connectivity, diagnose a lifecycle problem, and justify a testing approach? Mark each response as confident, partial, or unknown. This baseline determines whether you need foundational development practice or targeted review.
Phase three: study by decisions
For every weak area, write a decision question such as “What constraint makes this approach unsuitable?” or “How would I detect and isolate this failure?” Read the relevant technical material, implement the smallest useful example, and explain the result in your own notes. Decision-based study is more durable than copying definitions into flashcards.
Phase four: review under limits
After the concepts are understood, rehearse concise reasoning. Read a scenario, identify the requirement, eliminate options that violate it, and select the remaining approach. Review why the alternatives fail. This is a practical recommendation, not a claim about the exact 70-357 item format; the official session confirms test-taking techniques were part of its preparation content, but not a specific question structure.
A practical six-stage study roadmap
Use the roadmap only after verifying that the exam is relevant and available. Its sequence moves from scope control to implementation and review, which prevents a common failure mode: collecting old resources for weeks before discovering that the credential cannot be earned or that the material no longer serves the candidate’s career objective.
Stage one: make a status decision
Open the relevant Microsoft Learn certification or exam details page and look for an active scheduling path. If no official path exists, stop treating 70-357 as a schedulable target. Save the official retirement guidance with your notes so that your study record clearly distinguishes historical research from an active certification plan.
Stage two: collect authoritative scope material
Start with Microsoft’s 70-357 preparation session and any official resources still linked from Microsoft Learn. The session is designed for experienced mobile developers and reviews key exam topics and preparation resources. If an old link is unavailable, do not fill the gap with an unverified blueprint; record the missing evidence and narrow your claims.
Stage three: create a working lab
Choose a small mobile application that lets you exercise the areas you can verify. Keep the implementation limited enough to inspect, test, and troubleshoot. Add notes for requirements, platform assumptions, failure conditions, and corrective actions. The lab is a preparation recommendation, not an official requirement, but it gives an experienced developer a stronger way to identify genuine gaps.
Stage four: connect concepts to failures
Break the lab deliberately: remove a required dependency, introduce delayed data, produce an invalid input, or change an application-state assumption. Then diagnose the symptom and document the remedy. Use only scenarios supported by the technology you are actually studying. The purpose is to practice reasoning about mobile constraints, not to recreate confidential exam content.
Stage five: conduct a source-controlled review
Review your notes in three columns: confirmed by Microsoft, supported by technical documentation, and personal inference. Keep the first two columns as your core preparation. Recheck old screenshots, course pages, and forum claims against current official information before relying on them, because legacy exam pages and training materials may remain accessible after retirement.
Stage six: choose the next credential or project
If 70-357 cannot be scheduled, convert the work into a current plan. Compare your mobile-development experience with available role-based certifications or relevant learning paths on Microsoft Learn. The mapping article can explain Microsoft’s broader transition from 70-xxx exams to role-based certifications, but it does not by itself certify that a particular modern credential measures the same mobile-app skills.
Which Microsoft preparation resources are useful?
Microsoft’s general preparation guidance recommends study guides, exam-preparation videos where available, self-paced learning paths, instructor-led training, and Practice Assessments for some exams. For 70-357, availability of those resources may be limited because the exam is legacy material. Use each resource according to its evidence and date, and never assume that a current resource belongs to this retired exam.
Study guides and exam pages
Microsoft says study guides summarize exam topics, link to additional resources, and explain available self-study or classroom options for role-based, specialty, and fundamentals exams. Since the supplied research does not provide a current 70-357 study guide, look for an official archived page only as a reference. Do not invent missing objectives from a different mobile or developer certification.
The official 70-357 video
The Microsoft Learn episode titled “Cert Exam Prep: Exam 70-357: Developing Mobile Apps” is the most direct supplied preparation resource. Microsoft describes it as a fast-paced review for experienced mobile developers that includes key topics, resources, and test-taking techniques. Watch it critically: extract subjects and explanations, but verify whether linked technologies are still relevant to your intended work.
Self-paced learning
Microsoft Learn offers bite-sized, interactive modules and tutorials, with learning paths searchable by product, role, and level. For a current alternative, search by the role you want to perform and compare the published objectives with your existing skills. For historical 70-357 preparation, use modules only when their content clearly supports a verified topic.
Practice Assessments and the sandbox
Microsoft says some exams have free Practice Assessments delivered through Microsoft Learn, and that the exam sandbox demonstrates the look and feel of the exam. The supplied evidence does not confirm a 70-357 Practice Assessment or sandbox entry. If neither is listed for this exam, do not substitute commercial dumps or claim that a generic assessment predicts performance.
How should you handle delivery and registration details?
Do not assume that current Microsoft registration instructions mean 70-357 can still be delivered. For an active Microsoft exam, the registration process begins on the certification or exam details page, where the candidate selects the available provider. For a legacy exam, the first delivery question is whether an official scheduling button exists at all.
The current registration workflow
Microsoft’s registration guidance says candidates begin from a certification overview or the browse-all-certifications page, open the certification details, and select “Schedule exam.” Candidates taking a certification independently or through training generally select “Schedule with Pearson VUE,” while students or academic candidates may be directed to Certiport. These instructions are for available exams and should not be treated as evidence that 70-357 is schedulable.
Online and test-center choices
For available exams, Microsoft says candidates may in many cases choose an online exam or a local test center. An online choice requires a system pre-check and a testing area that meets security requirements; a test center provides a pre-configured environment. Availability depends on the exam provider. Because 70-357 is legacy material, verify the live provider page rather than planning around either option.
Identity and accommodations
Microsoft advises candidates to request accommodations before scheduling so the provider has time to review the request. It also requires the legal name in the Learn Profile to match the legal identification used for testing. These are useful general safeguards for an active exam, but they do not overcome a retired exam’s unavailable registration path.
What mistakes waste the most preparation time?
The largest mistake is preparing as though an old exam were active. Other avoidable errors include trusting an unlabeled blueprint, confusing a video’s historical scope with current product guidance, studying recognition questions instead of implementing skills, and using leaked or purported exam content. A disciplined status check and source-controlled notes prevent most of these problems.
Mistake: treating a third-party listing as official status
A page advertising 70-357 may describe an old exam without showing whether Microsoft still accepts registrations. Confirm status through Microsoft Learn and the official retirement policy. If the official scheduling path is absent, change the objective rather than buying more preparation material.
Mistake: accepting unsupported domain weights
The supplied official research contains no verified 70-357 blueprint percentages. Do not publish or study from percentage allocations unless Microsoft provides them for the exact exam and labels each domain. In particular, never compare bare percentages detached from their official domain names. A weighted plan based on invented figures can direct time away from the skills that matter.
Mistake: memorizing answer patterns
Dumps and leaked-question claims are not a reliable or legitimate preparation method, and memorization does not guarantee passing. They also conceal the reasoning needed to build and maintain mobile software. Replace them with documented exercises, troubleshooting notes, and explanations of why an implementation satisfies a stated requirement.
Mistake: ignoring the legacy context
The official 70-357 preparation session dates from Microsoft Ignite 2016, and Microsoft later shifted its certification program toward role-based credentials. That historical context matters. A candidate can learn from the session while still recognizing that terminology, tooling, and recommended career paths may no longer match current Microsoft offerings.
How do you decide whether your preparation is complete?
Completion should mean that you can demonstrate and explain the relevant skills, not that you have read a target number of pages. Before taking any action, check three conditions: the exam or replacement credential is officially available, your study topics are traceable to reliable sources, and you can solve representative development problems without relying on recalled answer strings.
Use an evidence checklist
For each study topic, retain the source, the implementation exercise, the failure you investigated, and the decision rule you learned. If a topic has only a forum mention or a commercial question, label it unverified. This checklist helps you remove attractive but unsupported material from the final review.
Use an explanation test
Choose a mobile-development scenario and explain the requirement, constraints, selected approach, rejected alternatives, and validation method. If you cannot explain the trade-off, return to the relevant documentation or lab. This test is a practical recommendation designed to expose shallow recall; it is not an official Microsoft scoring rule.
Use a status checkpoint
Before attempting registration, revisit the official Microsoft page. Retirement information can change for active exams, and Microsoft says exam information is subject to change. For a retired exam, however, the policy is decisive: it cannot be taken and the associated credential cannot be earned after retirement.
What should you do next?
If your goal is specifically to earn 70-357 now, verify its official availability before doing anything else; the supplied evidence points to a retired legacy exam rather than a current scheduling target. If your goal is mobile-development competence, watch the official preparation session for historical scope, audit your practical skills, and then select a current Microsoft Learn path or certification that matches your intended role.
A short action sequence
First, check Microsoft Learn for an official 70-357 exam detail and scheduling path. Second, record whether your objective is a legacy transcript requirement or current professional development. Third, use the official video and reliable technical documentation to build a topic list. Fourth, complete a small implementation and troubleshooting lab. Finally, verify a current role-based option instead of assuming a direct successor.
What to keep in your study file
Keep the official URLs, your status decision, a source-labelled topic list, lab notes, unresolved questions, and the reason for choosing your next credential. This creates a defensible preparation record and prevents old exam material from being presented as current Microsoft guidance.
Conclusion
Exam 70-357 is best approached as a legacy Microsoft mobile-development exam whose availability must be verified before preparation begins. The official evidence supports its subject and experienced-developer audience, but it does not supply a current blueprint, domain percentages, or confirmed delivery route. Make the status decision first, study through implementation and troubleshooting rather than memorization, and move to a current role-based certification when the actual objective is present-day validation.
