Issue: users are complaining of emails not showing up in search and you’ve determined you need to rebuild Exchange 2010’s search index.

Steps:

1. Launch Exchange Management Shell as administrator (right click run as administrator)
2. Type in the following in-order to get the names of the databases.

   get-mailboxdatabase

3.  Copy the name of the database you’d like to rebuild.
4.  Browse to the scripts directory by typing the following:

   cd\

    cd “program files\microsoft\exchange server\v14\scripts”

5. Enter the following command to rebuild:

    ResetSearchIndex.ps1 “Mailbox Database 1”

   Note: specify your desired database name instead of “Mailbox Database 1”

And that’s pretty much it! – Get the users to perform a full reboot.. That or just close and re-open outlook.