Unlike the rest of the methods you're using, the GetAttachmentFile() doesn't have Message # parameter and works of the curent message. I would recoment to select current message with Getmessage and process it w/o refering to the message # .

WITH THISFORM.Cusmapi1
	mNumberOfMail = .ReadMail()
	IF mNumberOfMail > 0
		FOR mMailCnt = 1 TO mNumberOfMail
			* Select current message
			.Getmessage(mMailCnt)
			mSender  = 'Sender     : ' + .GetSender()
			mSubject = 'Subject    : ' + .GetSubject()
			mBody    = .GetBodyText()
			mCount   = .GetAttachmentCount()
			IF mCount > 0
				FOR mAttachFileCnt = 1 TO mCount
					mAttachFile   = .GetAttachmentFile(mAttachFileCnt)
					MESSAGEBOX(mAttachFile)  &&Show Only 1st Email's Attachment
				ENDFOR
			ENDIF
		ENDFOR
	ENDIF
ENDWITH

>I m using NBC MAIP Mail Class to read attachment.
>
>But It only allow read 1st email's attachment.
>
>What wrong with my code? Thanks
>
>
>

>mNumberOfMail =THISFORM.Cusmapi1.ReadMail()
>IF mNumberOfMail > 0
>  FOR mMailCnt = 1 TO mNumberOfMail
>
>    mSender  = 'Sender     : '+THISFORM.CusMapi1.GetSender(mMailCnt)
>    mSubject = 'Subject    : '+THISFORM.CusMapi1.GetSubject(mMailCnt)
>    mBody    = THISFORM.CusMapi1.GetBodyText(mMailCnt)
>    mCount   = THISFORM.CusMapi1.GetAttachmentCount(mMailCnt)
>    IF mCount > 0
>      FOR mAttachFileCnt = 1 TO mCount
>        mAttachFile   = THISFORM.CusMapi1.GetAttachmentFile(mAttachFileCnt)
>        MESSAGEBOX(mAttachFile)  &&Show Only 1st Email's Attachment
>      ENDFOR
>    ENDIF	
>  ENDFOR
>ENDIF