[greywolfe]

From RIM:

Possible Causes and Solutions:

The attachment file type is invalid or not supported - Users should view the file on their desktop using the appropriate desktop software application.

The attachment is corrupt - Corrupt attachments cannot be opened using the attachment service.

The attachment is too large or complex, which causes the conversion to time out - This timeout is most common for .pdf files or ASCII .txt files that are larger than 10 MB. Users should view the file on their desktop.

The attachment size exceeds the maximum attachment size that is set by the corporation - Users should view the file on their desktop.

The attachment service is busy - It rejects any new attachment conversion requests until it is free. This rejection might occur if the user attempts to view an attachment while other users within the corporation are requesting large or complex attachments (specifically .pdf files). Users should wait 5 minutes, and then request the attachment again. The maximum request time for a conversion is 10 minutes.