"mailbox full" in outlook even when it's not

Make sure that your mailbox is not full, you can do 1 of the following things:

1. Run “Get-MailboxStatistics alias | fl StorageLimitStatus” on your Exchange server in the Exchange Management Shell
2. Log on to OWA and hover your mouse on your name in the left upper corner. A window will appear that tells you your mailbox current size and its maximum size.
3. Log on to the server. In the Recipients Configuration, check the current mailbox size of the user, and check the quota limit (tab Mailbox settings –> Storage quotas)

Once you’ve verified that your mailbox is NOT full (so the full mailbox notification is incorrect), you should do the following:

1. Open Outlook, click File (left top), Click Account Settings, double click your account name, and then uncheck “Use Cached Exchange Mode” and finish the wizard
2. Close Outlook. Delete your OST file. The default location for you OST-file on Windows  is C:\Users\user\AppData\Local\Microsoft\Outlook\. Either copy and paste the path in Windows Explorer, OR Enable Hidden Folders to view the AppData folder.
3. Open Outlook again and enable Cached Exchange Mode again (like you did in step 1, but now recheck)

Clearing up Event Id 1030

I was getting lots of Event Id 1030 errors on a workstation — “Windows cannot query for the list of Group Policy objects”. I know I am not the only one to have seen these errors in their event logs. Microsoft CSS posted the following reg edit patch which cleared up the Event 1030 errors on my workstation:

Remove Bad Stored Credentials from the Credential Manager:

1. Run Regedit2. Drill down to HKLM\System\CurrentControlSet\Control\Lsa
3. In the right pane locate the disabledomaincreds key
4. Change the disabledomaincreds value to 1 to stop store domain credentials.