From microsoft support: Click Start, click Run, type regedit in the Open box, and then click OK. Locate and then select the following registry subkey: * HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Options On the Edit menu, point to New, click Key, type Attachments, and then press ENTER. Locate and then select the following registry subkey:* HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Options\Attachments On the Edit menu, point to New, click DWORD(32-bit) Value, type FileTrackIdle, and then press ENTER. Right-click FileTrackIdle, and then click Modify. In the Value data box, type 5000, and then click OK.** Note If the issue persists, increase the value data by 1000 until you can successfully print all the PDF files. Exit Registry Editor. * When changing the registry key you will have to change the 12.0 to your version of outlook, You can find this by going to file->help->version. (in the example below i would put 14.0 instead of 12.0) ** Through testing on my server i have found a value of 15000 works best for any more than 10 emails. HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Options\Attachments\ FileTrackIdle = DWORD:5000 ps: if you want to print multiple emails with attachments but not the actual email just change the "Page range" to Pages:0
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