I recently had to upgrade an MS Access application from Office 2003 (MDB) to Office 365 (ACCDB). This application uses a SOAP connection to pull in XML from a Process Server in New York.
The original application was using MSSOAP30.dll in C:\Program Files(x86)\Common Files\MSSoap\Binaries\MSSOAP30.dll.
In order to upgrade the application, you will need to remove this MISSING dll and replace it with the new Office version.
Replace the Reference with the one shown below, found in C:\Program Files\Common Files\Microsoft Shared\OFFICE16\MSSOAP30.DLL.
OR this one for 32 bit Office.
C:\Program Files (x86)\Common Files\Microsoft Shared\OFFICE16\MSSOAP30.DLL.

If this happens then check the Application Event Log. If you see the message below then you need to change your registr settings
MAPISendMail: Failed to submit message. Attachments to the message exceeded the size limit set by your Administrator.
Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
If there is a Key called MaxiumAttachmentSize then delete it or enter a value of 1000+. Setting it to zero appears to cause this error.
Helpfull link: https://support.microsoft.com/en-ca/help/2813269/attachment-size-exceeds-the-allowable-limit-error-when-you-add-a-large
from here: https://www.lifewire.com/increase-outlook-attachment-size-limit-1173679
Increase the Outlook Attachment Size Limit
To change the size Outlook allows as a maximum for attachments to send:
- Press the keyboard shortcut Windows-R.
- Type "regedit" in the Run dialog.
- Click OK.
- Travel down the registry tree to the entry corresponding to your Outlook version:
- Outlook 2010: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\\Preferences.
- Outlook 2013: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\\Preferences.
- Outlook 2016: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\\Preferences.
- Double-click the MaximumAttachmentSize value.
- If you cannot see MaximumAttachmentSize:
- Select Edit | New | DWORD Value from the menu.
- Enter "MaximumAttachmentSize" (not including the quotation marks).
- Press Enter.
- Now double-click the MaximumAttachmentSize value you just created.
- Enter the desired attachment size limit in KB under Value Data:.
- To set a size limit of 25MB, for example, enter "25600."
- The default value (with MaximumAttachmentSize not present) is 20MB or 20480.
- For no attachment file size limit, enter "0." Practically all mail servers have a size limit, though, so "0" is not recommended; you would invariably get large messages back as undeliverable after an often long and fruitless uploading process.
- Ideally, the limit corresponds to your mail server's limit. Reduce the Outlook limit by some 500KB to allow wiggle room.
- Click OK.
1. Run regedit
2. Go to HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Common (repeat for muliple versions of MS Office)
3. Create a KEY called "Security" here by right clicking on the Common key and selecting New->Key and typing "Security"
4. Create a DWORD in the Security key by right clicking on Security, selecting New->DWORD and type in "DisableHyperlinkWarning"
5. Change the value of this DWORD to 1