Not all fields are available using different Mail options.  If there are fields that you need in your mail merge that are not available in Mail, create a mail merge in Export instead.
    Use these steps to create a Simple Word Merge document through Export. 
    1. Go to Export > New Export. 
    2. For Format, choose Blackbaud Simple Word Merge. 
    3. For Type, choose the desired record type to include. For example, Constituent for a mailing to each constituent. 
    4. Include all records or a selected query on the General tab.
    5. Select the Output tab and select the fields to be included in the mailing.
    6. To design the mailing format, click Edit merge document in the action bar.
    7. Word opens to a blank merge document. Notice the options in the action bar under Add-Ins: Insert Raiser's Edge Field, Insert Word Field, and Save and Return to RE7 to Merge.
    8. Type the body of the letter.
    9. To insert a merge field:
    • Select the Add-Ins tab in Word.
    • Click Insert Raiser's Edge Field and select from the list. To insert a Word field such as an If...Then...Else statement, click Insert Word Field.
    1. When the merge fields are inserted and the text of the letter is complete, click Save and Return to RE7 to Merge.
    2. To make further changes to merge document in Word, click Edit merge document.
    3. To view the merged letters, click Merge Now.
    4. When prompted, enter the name and location of the export file, and click Save.
    5. Word opens and the finished merge letters preview on the screen.
    6. Print the letters from Word.
    For more information, review the Mail Merge with Microsoft Word section of The Raiser's Edge & Microsoft Office Integration Guide.