Exchange issues...Out of Office issues

Hi guys, I have an Exchange environment with a few odd issues that are happening, was wondering if someone can point me in the right direction to correct these.

1. Frequently and intermittently get server unavailable messages on outlook when plugged in to the LAN, also happening to users offsite using Outlook Anywhere

2. Users cant set out of office - both via Outlook or OWA   When clicks on link to set out of office… it times out

3. Reports of people sending meeting invitations out, responding, but the responses are not being made back to the sender
   -This is typically from secretaries who have delegate access to the mail boxes
   -Meeting invitation going out… some people not getting it
  -Got the meeting invitation, the response does not get back to the meeting organizer… yet it shows up in the sent items folder of the respondee

4. •        Some free/busy information is having trouble publishing via the internet
   Sitting on multiple domains and have DNS setup a certain way
-Have mail server sitting in different domain space as users
-   Some MS articles saying they need to be on same namespace or have certain A records setup but they don’t know
-   This is happening to everyone that is not local
nutekconsultantAsked:
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Simon Butler (Sembee)ConsultantCommented:
Version of Exchange?
Do you have a trusted SSL certificate?

Most of what you have described is related to the availability service, which is found by Autodiscover, which breaks if the SSL certificate isn't trusted or setup correctly.

Simon.
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nutekconsultantAuthor Commented:
the Exchange is 2010 - I am not sure if there are SSL Certicificates, I am going onsite tomorrow
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Simon Butler (Sembee)ConsultantCommented:
SSL is very important - there will be an SSL certificate of some description, it comes down to whether it is trusted or not. If they are using OWA to the internet then you can check remotely by browsing to their OWA site and seeing what happens.

Simon.
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