Exchange 2013. How to stop disclaimer from appearing in replies.

To stop disclaimers to appear in replies, just add some random generated string to disclaimer and add exception to that rule. That special string could be the same color as background, so it will be invisible in message body. You can add just some text from the disclaimer to exception condition, but if that text will be in message body then disclaimer will not be added to that message.

To add rule login to exchange admin center, select "mail flow" -> "rules", click "add"->"Apply disclaimers..."
Enter name and condition when disclaimer should be applied, select action "Append disclaimer...", enter text,and at the end add something like "<span style="font-size:10.0pt; color:#FFFFFF">2578AABHKJ213</span>" (there 2578AABHKJ213 random generated string and html tags make text size 10pt and text color is white, so it will be invisible on white background)
Next press "more options..." link, select "add exception if subject or body contains..." and add "2578AABHKJ213"

Exchange 2013. Meeting invitations get stuck in a poison queue.

After meeting invitation arrives from external domain, and user accepts meeting. Meeting acceptance message some how crushes transport service and meeting initiator do not get confirmation about meeting acceptance.
The same scenario takes place when user trying to send meeting invitation from my organization to external. Transport service stops and then restarts.

Searching the web did not bring a lot of info, so I started to digging in event logs.
In the event log I found error 10003:

Event 10003, MSExchangeTransport
The transport process failed during message processing with the following call stack: System.ArgumentException: codePage is not detectable...

That probably happens because regional settings on server was set to "Lithuanian".
Check exchange configuration:

Get-RemoteDomain -Identity * | fl

CharacterSet and NonMimeCharacterSet on my server was set to iso-8859-13.
Change it to iso-8859-1("Western European ISO"):

Set-RemoteDomain -Identity * -CharacterSet iso-8859-1 -NonMimeCharacterSet iso-8859-1

after that users can send and accept invitations without any problems.

Exchange 2013 MSDiagnostics Error 1006

Error exist from exchange 2013 RTM to 2013 CU3
Error look like:

The performance counter ‘\\SERVER\LogicalDisk(HarddiskVolume1)\Free Megabytes’ sustained a value of ’0,15′, for the ’10′ minute(s) interval starting at ’8/20/2013 7:21:00 AM’. Additional information: None. Trigger Name:DatabaseDriveSpaceTrigger. Instance:exchndb1

It is not clear what does this error means, because 50% of hard drive space is free.
You can disable this notification. To do this edit configuration file:

C:\Program Files\Microsoft\ExchangeServer\V15\Bin\Microsoft.Exchange.Diagnostics.Service.exe.config

Change “ExchangeJobs.Triggers.DatabaseDriveSpaceTrigger” from “True” to “False”. After making changes do not forget to restart exchange diagnostic service.