It might help get this change if we provide a user flow. Here is a scenario:
The Accounts Payable team triages a stream of incoming PDF invoices, sent by vendors into a shared mailbox. AP needs to do more than just read the PDF's. Triage involves tagging the PDF's, and then filing them appropriately.
For example, our AP triage involves 'stamping' invoices with: a) the purchaser/approver; b) an internal cost code c) the related project, if any, and d) any related Purchase Order number. Then, the file is saved to whatever online or on-premises electronic filing cabinet comes next.
If Outlook could open attachments in the computer's default PDF handler, the process is simply:
Open. Edit. Save As.
Otherwise, there are several extra steps at the beginning:
Download. Navigate to Downloads. Open, Edit, Save As.
Or:
Preview. Download. Navigate to Downloads. Open, Edit Save As.
Or:
Preview. 'Save to OneDrive'. Navigate to this year's OneDrive Attachments folder. Open, Edit Save As.
Hence the frustration expressed in this discussion.