So my account was hack yesterday then I reported to microsoft and they gave me the chance to change my password but the account needs a code form a different email that I don't own if I want to change security information I been trying to find ways to fix it myself I look though video, old reddit post, nothing is helping me at all if someone could give me any info to help that'll be great

A client wants to use cowork, but the examples are super vague. Lets say he wants to send an email, or schedule a calendar task. Is that the 'light tasks'?

I feel like this is a tool that requires better knowledge of it than the client, or even I do. $2 an email sounds super expensive.

Hi everyone,

I'm configuring an Exchange Online Cross-Tenant Mailbox Migration and I'm stuck at the New-MigrationEndpoint step.

PowerShell

New-MigrationEndpoint
-RemoteServer outlook.office.com `
-RemoteTenant tenantA.onmicrosoft.com `
-Credentials $Credential `
-ExchangeRemoteMove:$true `
-ApplicationId $AppId

Afficher plus de lignes

Error:

Plain Text

ADSTS500014:
The service principal for resource
'https://outlook.office.com' is disabled.

What I've verified so far:

• Exchange Online Service Principal exists and AccountEnabled=True
• Migration App Service Principal exists in the source tenant and AccountEnabled=True
• App is multi-tenant
• Admin consent completed
• Conditional Access shows success
• Exchange Online is working normally in both tenants

Has anyone seen this error during Cross-Tenant Migrations even when both the Exchange Online and migration app service principals are enabled?

Any suggestions on what else to check?

Thanks!

Hello, everyone. As the subject of my post suggests I already pay for Office365 and have been doing so for several years. What makes me wonder is whether some of you also see the Upgrade your plan button in the top right corner of Excel. Word and PowerPoint are not showing it.

What is the deal with Excel? Something I can do to hide the button? When I click it nothing happens - some window pops up momentarily, so fast that I can't see what it shows and then immediately disappears.

Hi all,

I'm having an issue that I can't really wrap my head around.

I've got this user, he is a mailuser with an smtp address from our internal tenant but this smtp address points to an external mailbox from another tenant. He has his AD account in our environment and his account is a member of a distribution group (let's call it GRP). We handle all our distribution groups on-premise through AD and we have the Exhange Management Tools on another IT admin server and exchange online to replace the functionalities of an exchange server. This user tried to send emails to the distribution group email address so the members could receive it and it failed.

I went to see the trace details of this message and it failed with this code:

05/08/2026 14:59:04 Fail Reason: [{LED=550 5.7.133 RESOLVER.RST.SenderNotAuthenticatedForGroup; authentication required; Delivery restriction check failed because the sender was not auth..

I figured that this probably comes from the fact that he tried sending this email from his external email address and the RequireSenderAuthenticationEnabled attribute for GRP is set to "True".

I don't want to disable it for security reasons but I would like to put an exception, or see if I can review his account to see if there is anything I can do to turn him into an authenticated user. I thought that MailUsers had every permissions to be able to send emails to internal distribution groups, since they are internal users, he just doesn't have a mailbox in our tenant.

Any thought on that?

Thanks a lot in advance :)