Outlook Cached Mode Repeatedly Re-syncs Mailbox After Restart (Starts Again Around 3.99 GB)
Hi everyone, I’m experiencing a strange Outlook Cached Exchange Mode issue with a Microsoft 365 mailbox after a recent Windows rebuild and wanted to see if anyone has seen similar behavior. Environment: Microsoft 365 mailbox (Exchange Online) Outlook for Microsoft 365 Version 2605 Build 16.0.20026.20076 64-bit Windows 11 25H2 Fresh OS rebuild performed twice New Outlook profile created Office completely reinstalled OST recreated multiple times Issue: When Cached Exchange Mode is enabled, Outlook starts downloading/synchronizing mail normally, and the OST file continues to grow correctly. However, after every reboot or Outlook restart, Outlook again shows “Downloading…” starting from around 3.99 GB. Important observations: Online Mode works perfectly OUTLOOK.EXE closes properly after exit OST file is NOT deleted and continues growing Sync slider changes (1 month, 1 year, all mail) make no difference Disabling Outlook indexing did not help New Outlook profile did not help Reinstalling Office did not help Problem only started after OS rebuild Before rebuild, same mailbox worked normally in Cached Mode No pending office or windows update. It does not appear to actually re-download the mailbox from scratch because the OST size keeps increasing, but Outlook repeatedly processes/downloads from around the same 3.99 GB point after restart. Has anyone seen: Cached Mode replaying synchronization repeatedly after restart? Similar behavior on recent Current Channel builds? Security/EDR products interfering with OST synchronization state? Any known regressions with Outlook Version 2605 Build 16.0.20026.20076? Any suggestions or similar experiences would be appreciated.
Cannot install addins
I am a Microsoft 365 Personal user. When I try to add the Claude for Excel Addin (for the Desktop version of Excel), I get an error: "Error loading add-ins. One or more add-ins failed to load. See your add-ins.". However, this is not specific to the Claude addin, since every addin gives the same error. When I click on the My-Addins option and then "refresh", I get another error: "Access denied to catalog." Signing in and out of Office does not fix the issue. Clearing the Office 365 cache did not fix the problem. The issue extends to Powerpoint and Word as well. I cannot add any addins to the web versions of Office either. Interestingly, if I download an XML manifest file, I can use the "Manage my addins" option in the web versions of Office 365 to manually add the addins. But still no luck with the Desktop versions. Anyone have any thoughts on how to fix this? Do I need to manually reinstall Office 365? I also noticed that the "Get Add-ins" button in "Account" settings is disabled.OneNote breaks if I move it onto an external display
Hi guys I use OneNote extensively for work as my virtual notepad. At most of my working locations, I use my laptop - Dell Latitude 7440 - connected to either a Dell Docking station + 2 monitors, or a pair of samsung monitors which have an inbuilt hub, connect via USB-C and are daisychained together. I've never had any issues with OneNote in the past, but recently have found that if I try and move my OneNote window onto either external monitor, it seems to break OneNote - the whole window becomes just the index list which is normally a column on the left (where it shows all your notebooks and pages) and it won't actually display any of the content from the notebooks/pages. If I try minimizing that column, it has a complete breakdown as if its unable to properly load the actual page content. The only way to fix this is to drag the window back to my laptop screen and then close it and reopen. Has anyone else experienced this? It's really frustrating and affecting my productivity as I often need it side-by-side with other screens.
How to create a shared company calendar for time off and holidays?
I'M LOST I have spent DAYS trying to figure out some way to provide a shared company calendar with Holidays, PTO Schedules, On-Call Schedules, etc. We just want one place to see what's going on this week, who's available, and do we have a day off this week. BASIC information. After spending more than 3 days on this, I feel more lost than I did when I started. I could create a SharePoint Calendar. This calendar doesn't sync with Outlook for Mac or Apple Calendars and, most importantly, reoccurring events don't show up on a SharePoint Events web part. I could manually create reoccurring events but I rather not. Regardless, the functionality is incredibly limited. I could create a new M365 user. This would let me see these calendar in Apple Calendars and give myself or another admin access to update events. But this calendar can't be integrated in SharePoint or Teams so it's basically invisible. I could create a Channel Calendar in Teams but that's certainly not appropriate. I could create a new Group with a Calendar. Although, we already have a org-Wide Team and it doesn't actually do anything - can't email mailto:orgteam@company.com and it doesn't come with an Outlook calendar. I don't think I should have to add someone to a group for them to see a calendar I want public to the entire company. This might be the best compromise but that's besides the point. The POINT is, WHY in the world isn't this a built-in feature that's turned on the moment a company creates a M365 tenant? WHY do I need to spend days figuring out that all the archaic tutorials from 2017 don't even work in 2021? WHY can't MICROSOFT make calendars easy? I mean, I'd settle for difficult - it's better than impossible. And, not for nothing, I look like a complete idiot (I very well may be!) when my boss asks me to do something that should take 2 minutes and I have absolutely nothing to show 3 days later. Q: What is your business doing to let you know you have Memorial day off? How are you able to see if someone has the week off for vacation? Are you using a M365 product or something else?
outlook.office.com
I canno´t login in to outlook.office.com. Get the error message: UTC Date: 2026-04-05T10:38:19.885Z Client Id: C0B69CD1666C4BDCAD56171753860EF7 Session Id: e31a271e-c7b2-4f5f-abb5-854f463bfe2a Client Version: 20260320002.12 BootResult: configuration Back Filled Errors: Unhandled Rejection: Error: 500:undefined|undefined:undefined err: Microsoft.Exchange.Data.Storage.TenantAccessBlockedException esrc: StartupData et: ServerError estack: Error: 500 at Object.y [as createStatusErrorMessage] (https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.ad50be7b.js:2:299099) at https://res.public.onecdn.static.microsoft/owamail/hashed-v1/scripts/owa.mailindex.ad50be7b.js:2:23784 st: 500 ehk: X-OWA-Error efe: GV2PEPF0002396F ewsver: 15.20.9769.16 emsg: TenantAccessBlockedError And outlook on my devices don´t sync to exchange server Need some serious help/rzs43Migrating G suite to Office 365
Dears, Good day, I working on a company which hosted their email on G suite, and I want to migrate all mailboxes, calendar, tasks, files, all things to Office 365. kindly let me know the steps for Migration, we have 69 users needed to be completely migrated. Kindly advise
Prevent Microsoft 365 meeting invites from automatically appearing in users’ calendars
Hi All, We are trying to prevent Microsoft 365 meeting invites from automatically appearing in users’ calendars as Tentative until the user explicitly accepts the invite. Setting for Outlook Classic, New Outlook and Windows or Outlook Web. Need Microsoft recommendation on this one.
How to search emails in shared mailboxes in Outlook 365
When I search keyword, Outlook only shows the result from my default mailbox (personal mailbox). I have linked 2 more common mailboxes that I share with my team. None of us is able to find emails in the se common mailboxes. When we search for the unique keywords, Outlook only shows result from default Mailbox. OS: Windows 10
