The OTM file extension stores macro written for Microsoft Outlook email client application. All Outlook macros are kept in a single VbaProject.otm file that contains scripted programs created in the Visual Basic Editor. These functions are used for scanning email messages or collecting file attachments.
Microsoft Office Outlook
Outlook 2007 on Windows Vista/Windows 7
Outlook 2010 on Windows Vista/Windows 7
The OTM extension is created and opened using MS Outlook Email Client.
"These details consist of all OTM extension data in brief and precise" Marta | Azores