Why Not Automation

Important Questions

  • Why are Aspose components a much better option than Microsoft Office Automation?

There are two questions we often hear at Aspose :

  • Do your products require that Microsoft Office be installed in order for them to run?

The short, simple answer—NO.

Aspose and Aspose components are totally independent and are not affiliated with, nor authorized, sponsored, or otherwise approved by Microsoft Corporation.

  • Why should we use Aspose products instead of utilizing Microsoft Office Automation?

For one, there are many benefits you enjoy when you use Aspose.Slides.

For another, Microsoft itself strongly advises against the use of Office Automation from software solutions.


As we stated earlier, there are several reasons Aspose components are a better alternative to automation. Some of the key reasons are:

  • Security
  • Stability
  • Scalability/Speed
  • Price
  • Features

We expanded on the key reasons in the paragraphs below.


The following is a direct quote from a Microsoft Article:

“Office Applications were never intended for use server-side, and therefore do not take into consideration the security problems that are faced by distributed components. Office does not authenticate incoming requests, and does not protect you from unintentionally running macros, or starting another server that might run macros, from your server-side code. Do not open files that are uploaded to the server from an anonymous Web! Based on the security settings that were last set, the server can run macros under an Administrator or System context with full privileges and compromise your network! In addition, Office uses many client-side components (such as Simple MAPI, WinInet, MSDAIPP) that can cache client authentication information in order to speed up processing. If Office is being automated server-side, one instance may service more than one client, and because authentication information has been cached for that session, it is possible that one client can use the cached credentials of another client, and thereby gain non-granted access permissions by impersonating other users.”

Aspose products are very secure. Aspose components run in the same user context as all ASP.NET applications (under the ASPNET user). Therefore, Aspose components do not pose a security risk. They also do not consume critical system resources. Furthermore, when an Aspose component opens a document, macros do not get to run automatically. Aspose components were built to allow developers to create, manipulate, and save Office files.


This text is a direct quote from the previously referenced Microsoft Article:

“Office 2000, Office XP and Office 2003 use Microsoft Windows Installer (MSI) technology to make installation and self-repair easier for an end user. MSI introduces the concept of “install on first use”, which allows features to be dynamically installed or configured at runtime (for the system, or more often for a particular user). In a server-side environment this both slows down performance and increases the likelihood that a dialog box may appear that asks for the user to approve the install or provide an appropriate install disk. Although it is designed to increase the resiliency of Office as an end-user product, Office’s implementation of MSI capabilities is counterproductive in a server-side environment. Furthermore, the stability of Office in general cannot be assured when run server-side because it has not been designed or tested for this type of use. Using Office as a service component on a network server may reduce the stability of that machine and as a consequence your network as a whole. If you plan to automate Office server-side, attempt to isolate the program to a dedicated computer that cannot affect critical functions, and that can be restarted as needed.”

Since Aspose components are packaged into a single DLL, its users never need to install additional parts or pieces for them to function. Aspose components are only utilized by .NET applications and there is no portion of the component code designed to wait for a human response.


The following is a direct quote from a Microsoft Article:

“Server-side components need to be highly reentrant, multi-threaded COM components with minimum overhead and high throughput for multiple clients. Office Applications are in almost all respects the exact opposite. They are non-reentrant, STA-based Automation servers that are designed to provide diverse but resource-intensive functionality for a single client. They offer little scalability as a server-side solution, and have fixed limits to important elements, such as memory, which cannot be changed through configuration. More importantly, they use global resources (such as memory mapped files, global add-ins or templates, and shared Automation servers), which can limit the number of instances that can run concurrently and lead to race conditions if they are configured in a multi-client environment. Developers who plan to run more then one instance of any Office Application at the same time need to consider Pooling or Serializing Access to the Office Application for avoiding potential Deadlocks or Data Corruption”.

Aspose components are incredibly scalable and lightning fast. Office applications were not designed to be simultaneously used by 100s or 1000s of users, but Aspose components are designed for that precisely. Our components are a true .NET solution.


When an application utilizes Microsoft Office Automation, a copy of Microsoft Office has to be purchased for every machine that runs the app. There are many instances an application may need to create or manipulate an office file, but the process does not require Microsoft Office.

When creating web-based applications, it is important to remember that Microsoft Office Automation components are neither priced nor licensed for server-side solutions. Therefore, there is no good licensing solution for the deployment of web applications that utilize Microsoft Office components. Aspose, on the other hand, provides a very cost-effective solution for server-based applications as well.


Aspose components provide everything needed for managing Office files and a lot more. We designed them based on our philosophy of helping developers to accomplish the greatest results possible with the least amount of effort.

For instance, Aspose.Cells gives developers the ability to import data from a DataTable or DataView directly into an Excel file. Aspose.Words provides a similar feature that allows developers to populate a Word (that is, Mail Merge) document directly from any .NET data object. Every component in the Aspose family offers their own set of unique and powerful features.

The best part of purchasing an Aspose component is getting access to our development teams. For example, if you use Office Automation objects and need certain features, the chances of you getting those features to be added are very, very low. However, things are different with Aspose components.

Our teams are always open-minded and flexible when providing assistance—and this is the reason Aspose components have grown to become as powerful as they are now.