Outlook crisis post update/reboot

Hello Experts,

I am in a crisis.  Last night I performed regular updates on my Exchange server (2010) and was forced to reboot.

I also rebooted the BESX server , which happens to be one of two DCs and one of 3 DNS servers.

The DC's are server 2008 and the third DNS is Server 2003.  The2k3 box is the OLD DC but is still not totally ready for removal as all services are not fully migrated.

After reboot, I tested mail flow and confirmed it was working.  I also tested the admin account using Outlook.

Now all 40 plus users are having issues connecting to Exchange.  All Outlook clients get the same error:  0x8004011d .  

In order to get them back up, I had to recreate all Outlook profiles and NOT attach the profile to any other mailboxes but the user's own.  (there is ALOT of mailbox sharing as some users are assistants to other users)

No mailbox can connect to another mailbox even though the permissions are set in sharing in Outlook.

PFDAVAdmin does not work and I am pretty weak in Powershell.

I have checked DNS by pinging the mail server by name from random machines and all machines can find the mail server.

OWA works as does Active Sync and I believe all users in BESX.

I am very baffled and need much guidance.

Thank you in advance for any and all help.
mediatechnicaAsked:
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mediatechnicaConnect With a Mentor Author Commented:
I believe the issue has been resolved.

Oddly, the Exchange server was ping-able by name, but nslookup could not resolve.

Checking DNS on all DNS servers, there was NO record of the Exchange server.  Adding A record to DNS and commands ipconfig /flushdns and ipconfig /registerdns on all machines resolved the Outlook mailbox connection issue.

Now my concern is "why did DNS "lose" the Exchange server?"

Thanks for reading and answering anyways.
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David Johnson, CD, MVPOwnerCommented:
Try restarting your exchange services as shown in this post http://forums.msexchange.org/m_30795900/mpage_1/key_/tm.htm#1800536445
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mediatechnicaAuthor Commented:
Further troubleshooting with the help of a second IT person led to the missing DNS record discovery.

As stated in previous post, as soon as DNS entries were made for Exchange server and DNS flushed and re-registered, all outlook connectivity issues were cleared up.
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