This can ultimately lead to corruption in the database files. Limited storage in Outlook – The slow performance of Outlook may be due to very less space in the storage field.Data Dynamic Exchange is corrupted – One of the reasons of delay in opening Outlook attachments may be crashed Data Dynamic Exchange.Big updates in Outlook – If you are updating Outlook that takes too much time and in turn, it is consuming a large space on the disk, your Outlook application performance may get slower.Some of the reasons that we can consider are – There may be different reasons for this delay in opening and linking of Outlook attachments. Also, the time rate for message exchange could be large when you try to link or download an attachment to/from an email. But, sometimes there are the conditions when you face difficulty or a lot of time to open the Outlook attachment. So, we can say that attachments are clearly important from the Outlook usage point of view. The larger the attachment size, the larger is the size of a PST file. It shares a large storage size part of MS Outlook. The attachments are generally enclosed within an email to communicate the information through multimedia and office files – documents, images, media, etc. MS Outlook, the popular email client carries attachments as the vital informational data.