Exchange 2007 Transaction Log Scripting

I'm looking to automate the purging of Exchange 2007's transaction logs.  I could run command #1 and receive as output #2 then string parse out the value #3.

1. eseutil /mk "C:\Program Files\Microsoft\Exchange Server\Mailbox\First Storage Group\E00.chk"
2. Extensible Storage Engine Utilities for Microsoft(R) Exchange Server
   Version 08.00
   Copyright (C) Microsoft Corporation. All Rights Reserved.
   
   Initiating FILE DUMP mode...
         Checkpoint file: C:\Program Files\Microsoft\Exchange Server\Mailbox\First Storage Group\E00.chk
   
         LastFullBackupCheckpoint: (0x0,0,0)
         Checkpoint: (0x16CDE,480,0)
         FullBackup: (0x0,0,0)
         FullBackup time: 00/00/1900 00:00:00
         IncBackup: (0x0,0,0)
         IncBackup time: 00/00/1900 00:00:00
         Signature: Create time:06/03/2008 17:26:39 Rand:7564394 Computer:
         Env (CircLog,Session,Opentbl,VerPage,Cursors,LogBufs,LogFile,Buffers)
             (    off,    502,  25100,  14460,  25100,   2048,   2048,2000000000)
   
   Operation completed successfully in 0.101 seconds.
   
3. 016CDE

Or is there a slicker way to retrieve value #3?  Someway for PowerShell to tap directly in to this value?  This value represents the lowest number of the transaction log files that are still in use by the Exchange Server. 

Did you ever figure out a solution to this?  I have looked high and low and I'm tired of deleting our transaction logs manually!  Thanks!