|With Category-Manager you can group your Outlook categories, share them with other users, filter a folder by category, automatically categorize new emails, and more. You can use the Addin even for IMAP.
This sample creates a serial number and stores it in a simple text file. Please note, the directory must already exist while the file will automatically be created if necessary.
Public Function GetNextID() As Long
Dim lCurrID As Long
Dim File As String
File = "C:Sample.txt"
lCurrID = Val(ReadFile(File))
lCurrID = lCurrID + 1
WriteFile File, CStr(lCurrID), False
GetNextID = lCurrID