If you cannot search e-mails neither fom Outlook or OWA then you have problems in the database's index catalog. To fix it on a single server you can use the following article: http://technet.microsoft.com/en-us/library/aa995966(EXCHG.80).aspxBut if you have databases in a DAG you have to do something else:1- Suspend all replica databases;2- Follow the directions described on http://technet.microsoft.com/en-us/library/aa995966(EXCHG.80).aspx;3- Delete the Index Catalog on Replica databases;4- Resume the replica databases.To check how the process is going do the following:1- Open Reliability and Performance Monitor (perfmon.exe).2- In the console tree, under Monitoring Tools, click Performance Monitor.3- In the Performance Monitor pane, click Add (green plus sign).4- In Add Counters, in the Select counters from computer list, select the server on which the mailbox database you want to monitor is located.5- In the unlabeled box below the Select counters from computer list, select Full Crawl Mode Status in the MSExchange Search Indices performance object.6- In the Instances of selected object box, select the instance for the user's mailbox database.7- Click Add, and then click OK.8- To make easier to monitor the Full Crawl Mode Status, right-click on graph screen then Properties.9- Select Graph tab.10- On View Combo box select Histogram bar and Maximum Vertical Scale insert 2, click OK.When you see a bar for a database it means that the index catalog is been created (value 1), if you don't see a bar meens the indexing has finished for that database.Related sites:http://technet.microsoft.com/en-us/library/aa995966(EXCHG.80).aspxhttp://technet.microsoft.com/en-us/library/aa998289(EXCHG.80).aspxhttp://technet.microsoft.com/en-us/library/bb123701.aspx I had this problem on SCCM 2007 SP2 R3 installed on Windows Server 2008 R2 SP1.To fix this annoying issue is necessary to rebuid the NAL: Rebuild NAL:========1. Stop sms_site_component_manager and sms_executive service.2. New a registry key: HKLM\software\wow6432node\microsoft\Nal\server\providers3. Add a Reg_Multi_SZ value under it. The name should be Active Order4. Double click it, input the valueLOCALMSWNETNWNDSNWBIND5. Open command line window. Go to the SCCM installation path. By default it will under \program files (x86)\microsoft configuration manager\bin\i386 folder.6. Run following command line:regsvr32 abnwsvr.dllregsvr32 falsvrn.dllregsvr32 mslmsvrn.dll7. After all the .dll is registry successfully, there will be 2 new value generated under the Active Order.8. Then we will do a site reset. Close the SCCM console if it is opened. Go to Start\All programs\microsoft system center\configuration manager 2007\configmgr setup9. When the setup is launched, please choose Perform site maintenance or reset this site.NOTE: It is not default choice, please make sure the choose of here to avoid remove the site by mistake!10. Choose the Re-apply default file and registry permissions on this site server11. Click Next till finish. Then reset the site is doing.12. After finish, there will be a new key generated. It called Connections, there is a value under it, it is Operational Active Order.13. After that, the NAL seems rebuild. Restart the server, then your Distribution Point will be working fine.Source:http://social.technet.microsoft.com/Forums/en-US/configmgrswdist/thread/ff715474-18de-4bd5-a004-53ebc23bd966/http://scug.dk/blogs/configurationmanager/archive/2010/01/29/distribution-manager-nal-error.aspx If after installing SCCM 2007 SP2 on Windows 2008 R2 you get the following error on SMS_MP_CONTROL_MANAGER "SMS Site Component Manager faild to install component SMS_MP_CONTROL_MANAGER on server" you have to enable the webdav and configure it properly.Steps:1- Open IIS Manager > Sites > Default Web Sites > WebDAV Authoring Rules;2- Click Enable WebDAV