Issue: Out-Of-Office (OOF) is not being sent

Issue: Out-Of-Office (OOF) is not being sent.

(also you see event id 3004 in the application log of Exchange mailbox Server:

The Rules quota of mailbox XXX has been reached and the automatic reply rules can't be enabled or updated. Delete some existing rules or increase the user's rule quota and try to set the automatic reply again. You can use the Set-Mailbox cmdlet to increase a user's rules quota.)

Resolution:

Increase the user rules quota:

Get-mailbox XXX | select rulesquota

Set-mailbox XXX –RulesQuota 128KB

Autodiscover for Exchange (Outlook) and Offline Address Book; Out of Office Assistant

It is a well documented fact that _autodiscover._tcp SRV record in the userdomain.com DNS zone is needed for the proper autodiscover work in Outlook (and also Offline Address Book download in cached mode and Out of Office Assistant setup).

In addition autodiscover.userdomain.com A (or CNAME) record might be needed as well.

Usually _autodiscover._tcp.userdomain.com SRV record is enough for configuration to work properly, but it seems like autodiscover.userdomain.com is being queried first and if that query fails, it queries _autodiscover._tcp.userdomain.com: I had an instance that the userdomain.com zone did not have autodiscover A record and even though other zones with similar configuration worked fine, the particular one users had problems with autodiscover.