Outlook Not Syncing with Microsoft 365

Outlook sync issues can come from credentials, profile corruption, mailbox size, add-ins, licensing, DNS, authentication changes or Microsoft 365 service settings.

Check webmail first

If Outlook on the web works, the mailbox may be healthy and the issue may be local to the device or Outlook profile.

Profile and cache issues

Corrupt Outlook profiles and large OST files can cause slow syncing, missing mail or repeated password prompts.

Business impact

For businesses, email outages need careful handling because changes to DNS, licensing or authentication can affect multiple users.

Microsoft 365 support

Karma Techs helps Gold Coast businesses with Outlook, Exchange Online, shared mailboxes, user access and practical Microsoft 365 troubleshooting.