Outlook app · Android
Outlook not syncing on your Android phone
If new emails only appear when you open the Outlook app on your Android phone, the culprit is almost always Android's battery optimisation quietly putting Outlook to sleep in the background. Set Outlook to "Unrestricted" under Settings > Apps > Outlook > Battery, allow unrestricted background data, and stop swiping the app closed — then, inside Outlook, reset the account and clear the cache. That combination fixes the vast majority of Android sync problems. Rated 4.9 on Google.
- ● Outlook app for Android
- ● Battery optimisation = #1 cause
- ● No emails lost — they re-download
Why it happens
Why Android stops Outlook syncing in the background
To save battery, Android aggressively "optimises" apps it thinks you're not using — pausing them in the background so they can't check for new mail. Outlook is a common victim: it looks idle, Android sends it to sleep, and so new emails don't land until you actually open the app and it wakes up to sync. On top of that, Data Saver and per-app background-data limits can block Outlook from using the internet in the background at all.
There's also a habit that makes it worse: force-closing Outlook by swiping it out of your recent apps. On many Android phones that's read as "don't run this again until I open it", which switches off background syncing entirely. The fixes below undo all of that. None of them delete your mail — everything re-downloads from the server, so your inbox is safe.
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The fix
Step-by-step: get Outlook syncing on Android again
- Stop Android sleeping the app. Go to Settings > Apps > Outlook > Battery (on some phones it's App battery usage or Battery usage) and set it to Unrestricted (or "Don't optimise"). This is the single most important step.
- Allow background data. In Settings > Apps > Outlook > Mobile data & Wi-Fi (wording varies by phone), turn on Background data and Allow data usage while Data Saver is on so Outlook can sync even when Data Saver is active.
- Stop force-closing it. Don't swipe Outlook away in the recent-apps view — leave it running in the background so it can keep checking for mail.
- Update Outlook and Android. Open the Google Play Store and update Outlook, and check Settings > System > Software update for any Android update. Sync bugs are often fixed in newer versions.
- Reset the account inside Outlook. In the app, tap your profile icon (top-left) > the gear/Settings icon > tap your email account > Reset Account. This forces a clean handshake with the mail server and clears the cache. Your mail re-downloads afterwards — nothing is lost.
- Check notifications and sync settings. While you're in Settings, make sure notifications for the account are set to All, and that mail (and calendar/contacts if you use them) are set to sync.
- Still stuck? Remove and re-add the account. As a last resort, in Outlook's account settings choose Delete Account, then sign back in with your email and password. A fresh sign-in rebuilds the connection. Your mail lives on the server, so it comes straight back — just make sure you know your password (and any 2-factor code) first.
These are the Android steps. The Outlook app on iPhone/iPad is very similar (Settings > the account > Reset Account), but the battery and background-data controls live in different menus on Apple devices — this page is written for Android.
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// GOOD QUESTIONS
Frequently asked
Why is Outlook only syncing when I open the app on Android?
Android's battery optimisation is putting Outlook to sleep in the background, so it only checks for mail when you open it. Set Outlook to Unrestricted under Settings > Apps > Outlook > Battery and allow background data, and it will sync throughout the day.
Will resetting my account in Outlook delete my emails?
No. Reset Account just clears the local cache and forces a fresh connection to the mail server. Your emails, calendar and contacts live on the server and re-download automatically once it reconnects.
Does force-closing the Outlook app stop it syncing?
Yes, on many Android phones. Swiping Outlook out of recent apps can tell Android not to run it in the background, which switches off syncing. Leave it running and it will keep checking for new mail.
Where is the battery optimisation setting for Outlook on Android?
Go to Settings > Apps > Outlook > Battery (sometimes shown as App battery usage or Battery usage) and choose Unrestricted or Don't optimise. Menu wording varies slightly between Samsung, Google Pixel and other brands, but it's always under the app's battery settings.
I've tried everything and Outlook still won't sync — what next?
Remove and re-add the account: in Outlook's account settings choose Delete Account, then sign back in with your email and password to rebuild the connection. If it still won't sync, there may be an account or server-side issue — give us a call and we'll investigate.
Can 365 Techies fix Outlook sync on my Android phone remotely?
We support the Outlook Android app and the Microsoft 365 account behind it. We'll talk you through the phone settings and, where the problem is on the account side, fix that remotely in minutes. Call 01202 775566.
Phone still not pulling mail?
If you've set Outlook to Unrestricted and reset the account and it's still not syncing, there may be an account or server-side issue behind it. Call 365 Techies on 01202 775566 — we support the Outlook Android app and the Microsoft 365 account behind it, and we'll get your mail flowing again.
01202 775566 · help@365techies.co.uk · MON–FRI 9AM–5PM