There was an unexpected server shutdown , on a sql server box . Upon restart one of the databases went into an IN RECOVERY state ,
and once the database had reached 99% complete  the following message appeared in the SQL Server log files .

SQL Server detected a DTC/KTM in-doubt transaction with UOW  {63E15310-78DA-42DA-8BB1-38B59FDA866E}.Please resolve it following the guideline for Troubleshooting DTC Transactions.

Initially I tried the  : KILL '{63E15310-78DA-42DA-8BB1-38B59FDA866E}' WITH COMMIT   ,but this didn't resolve the issue.

The resolution was achieved by :

1)  Type "mmc.exe" (without the quotation marks) in the Run dialog box to open Microsoft Management Console (MMC).
2)  In MMC, on the Console menu, click Add/Remove Snap-in.
3)  In the Add/Remove Snap-in dialog box, click Add.
4)  In the Add Standalone Snap-in dialog box, click Component Services, and then click Add to add the snap-in.
5)  Click Close.
6)  In the Add/Remove Snap-in dialog box, click OK.
7)  In the console root under Component Services, expand Component Services, point to Computers, point to My Computer, and then click Distributed Transaction Coordinator.
8)  Select Transaction List. You see transactions in the details pane. Right-click the transaction, and then click Resolve. You now have three options: Commit, Abort, or Forget. Choose the one that is appropriate for your situation.

Author: Jack Vamvas (http://www.sqlserver-dba.com)